New Delhi, Dec. 9 -- The ministry of external affairs (MEA) on Monday advised its citizens travelling to China to be careful and sought reassurances from Chinese authorities that its nationals won't be harassed at Chinese airports in the wake of the detention of a woman from Arunachal Pradesh at Shanghai airport. New Delhi had earlier lodged a protest with Beijing after the woman was detained on November 21 by authorities who declared her Indian passport invalid. P6...